First, I did search the entire site and forums for instances of the keyword Yoast, and second, this issue is easily replicated on a clean install of WordPress...
When trying to apply policy AAM000012, which "contains all the default capabilities that are assigned to the Administrator role with a fresh WordPress install," I noticed that some of the admin menu items for the user to which the policy is applied are empty. Attached is a screenshot.
Once the Yoast plugin was determined to the the culprit on my production site, I set up a clean WP install, added the AAM plugin, applied policy AAM000012 to a user with the Subscriber role, and it worked beautifully. But once I activated the Yoast plugin, the admin menu output for the user with the Subscriber role seemed to be missing items.
Furthermore, when trying to access the "all posts" screen by clicking on the Posts admin menu, WP spits out, "You need a higher level of permission. Sorry, you are not allowed to edit posts in this post type."
I'm only five to ten hours into working with the concept of policies, and it is incredible! I just wish I could apply this policy to my production site, which is running the Yoast plugin.